I certainly like the point of this song: how it goes from slow to fast. It works.
Because I like orchestral music I immediately think: make the contrast bigger by putting in more instruments on the fast part than there are in the quiet part. But on second thought, I don't think this song needs it. The simplicity is fine.
I do indeed think it's worthy for the audio portal, but it's not something I would love to listen to more than one or two times. The first time you hear it it's pretty cool and you think: "Hey, that's original!", but once the surprise isn't there anymore it is, although still calm and kind of soothing, not that exiting to listen to anymore.
So my conclusion is: pretty original and something classical-ish I haven't heard before, but only 36 seconds of pleasure, which is short for a song. If you could either make a 2-minute song or make it loop and the 60 percent build-up a bit shorter, I'm sure you'll get a really good song.
Review request club